# Controls, Inputs and Outputs

The illustration below shows the various displays, controls and connections available on the B3603 and is followed by a basic functional description of each.

Input –  DC voltage source connects here.   Accepts between 6 and 40 volts dc.   The input voltage must be higher than the desired output voltage.   Also ensure that you use the correct polarity as there is not protection.

Output – DC Load or device that you want to power connects here.  The output is adjustable from 0 to 36 Vdc.   The output voltage must be lower than the input voltage.

Note On Input and Output  – These are non-isolated.  That is to say that the negative terminals for both the input and output are the same electrical point.

Display – When the output is off,  it will show the set points for both voltage and current.   When the output is on, it shows that actual voltage and current outputs.

The position of the decimal point is what determines whether the indication is for voltage or current.  In more advance modes, the display will also show the power and amp hours.

See the illustrations and explanations below.

Voltage is being displayed when the second decimal from the left is lit.

If the ‘Out’ LED is lit, then the actual voltage output is being displayed

If the ‘Out’ LED is off, the voltage set point is being displayed.

Current is being displayed when the first decimal from the left is lit.

If the ‘Out’ LED is lit, then the actual current output is being displayed

If the ‘Out’ LED is off, the current set point is being displayed.

If the first letter of the display in ‘P’, then actual power output is being shown.

The value being displayed is in watts.  Thus, “P2.00” is equal to 2.00 watts and P.200 is equal to .200 watts.

Watts of course meaning voltage times current.

If C is the first letter of the display, then amp hours are being shown.

These are cumulative since power was applied.

Thus a display of two means that two amp hours are have been drawn from the supply since it was last turned on.

CV LED –   When lit, the power supply is in the Constant Voltage mode.   This means the output voltage is at the value set and it is current that is varying.

CC LED – When lit, the B3603 is in the Constant Current mode.  This means the current limit has been reached and voltage is varying.

OUT LED  – When lit, the power supply is on and is supplying power.  When off,  its output is off.

SET BUTTON –  If the OUT LED is on, pressing the set button will turn the B3603 off.

If OUT LED is off,  pressing the set button will cause the display to cycle between the voltage and current set points.

OK BUTTON –  If the OUT LED is off, pressing the OK button will turn the power supply on.

If the OUT LED is on and display is showing a fixed value,  a quick press will cycle to the next value.

If the OUT LED is on,  pressing the OK button for more than a second will cause the display to enter a mode where it automatically cycles between the various power supply values or will cause the display to enter a mode where is displays a fixed value.

UP ARROW-   Pressing this button will increase the set point of what ever value is being display.

A quick single press, will increase the value by one digit.  Holding the button down will cause the value to increase rapidly.

The set points can be changed with the power output on or off.

DOWN ARROW-   Pressing this button will decrease the set point of the value being display.

A quick single press, will decrease the value by one digit.  Holding the button down will cause the value to decrease rapidly.

Set points can be decreased with the power output on or off.